1. PORDATA - The Database of Contemporary Portugal. Ageing index.
https://www.pordata.pt/en/Europe/Ageing+index-1609
. Accessed 3 Mar 2019
2. INE - Statistics Portugal. Projections of resident population in Portugal 2015 and 2080.
https://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ine_destaques&DESTAQUESdest_boui=277695619&DESTAQUESmodo=2&xlang=en
. Accessed 16 Mar 2019
3. Goes, M., Oliveira, H., Lopes, M.J.: Spatial analysis techniques applied to the characterization of elderly population for the planning of nursing care. RIASE - Revista Ibero-Americana de Salud Y Envejecimiento 2(3), 638–650 (2016).
https://doi.org/10.24902/r.riase.2016.2(3).693
4. INE - Statistics Portugal. Population´s density (No./km2) by Place of residence (at the date of Census 2011). from (INE):
https://www.ine.pt/clientFiles/bsXhOiSE4Vgv-1t8J_8qFeVt_22967.xls
. Accessed 25 Jan 2019
5. INE - Statistics Portugal. Ageing ratio by place of residence, data reference period 2017. from (INE):
https://www.ine.pt/clientFiles/ZABbysovUAa8_SgERrcmeKpY_23158.xls
. Accessed 25 Jan 2019